Помогите пожалуйста! Воткните артикль там, где нужно. main systems of

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Воткните артикль там, где нужно.



main systems of body have groups of organs working together to perform complex functions.

mouth, esophagus, stomach, small and large intestines are organs which compose digestive system.

There are some organs within each system.

circulatory system is also called cardiovascular system.

The main function of respiratory system is to convey oxygen and to remove carbon dioxide